slack-desktop: update to 3.1.0.
slack-desktop: update to 3.1.0.

Closes: #12562 [via git-merge-pr]
Signed-off-by: Jürgen Buchmüller <2642204b262fe30d9fcde46ee57f8ed7ac19ed92@t-online.de>

necrophcodr/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages